The side bar has some information. Orders prior to October 15th 2016 will be unaffected along with quotes expiring prior to November 15 2016.
The shipping and handling charge has remained the same since 2012 while UPS has raised their charges around 5% annually.
After running the pricing calculator for the tops and bases the finger-in-the-wind method worked quite well for the double-wide units but not so much for the single-width ones. The new prices better reflect the actual costs of producing them.